I was a lot like you...perpetually hungry. everyone was amazed, they actually thought i was pregnant. anyway, with some experimenting this is how i am eating now...

I am a fitness instructor and teach 2-3 classes a day right now but not doing a lot of training (i also train 2-3 clients a day as well).

Typically i eat for breakfast:
2-3 fruits, one serving of spelt cereal with milk and two tablespoons of mixed nuts. coffee, my only vice. no sugar, just a bit of milk in it

4 hours later i eat:
a banana, some kind of home made muffin or a one piece of toast, one serving of protein (chicken, or tofu or something like that), one serving of dairy (usually cheese, not low fat) and some veggies.

4 hours later:
plain yogurt (but not low fat, no added sugar, gelatin or corn starch either), celery and peanut butter with raisins (my favorite) and that usually takes me to dinner a couple of hours later

dinner will vary: protein, one serving of grains, and all the veggies i can handle.

I don't find that i am tired or hungry. when i do my own training, i will add in extra servings of everything depending on what i am doing.

I don't eat more than one serving of regular wheat per day (all grains are other kinds like millet, barley, buckwheat etc) and i don't add sugar to anything. any sweetener is either honey or maple syrup.

I lost 13 pounds this way over the summer, and i have no problem maintaining it. (i was 130 and holding 117 now). i don't have cravings any more, and i was really amazed about not adding sweetener to coffee.

Anyway this is what works for me. I recommend doing a lot of reading, researching and talking to a nutritionist.

Good luck!

Hannah